First off, welcome to YT! There are quite a few breeders in MI. One that comes to mind is
www.keencanines.com on here, her screen name is wrenee4.(Don't know if she has any puppies available or not) Have you checked out the yorkies for sale thread? If you have no luck there you could also try
www.ytca.org for a list of breeders that belong in your area. Good luck in your search!